LG GT350 - Page 91

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Only for training and service purposes
4. TROUBLE SHOOTING
LG Electronics 88/115 LGE Property
4.12.3 Checking Mobile SW & FEM
EGSM/GSM850 DCS/PCS
FE1 OFF ON
FE2 OFF OFF
TP3
_
C604
(
FE1
)
FL60
TP1
TP2
TP4
_
C605
(
FE2
)
TP5 ~ 8
Mobile SW & FEM Circuit Diagram
Figure 8. Mobile SW & FEM Circuit
Checking Points
Figure 9. Mobile SW & FEM
Table 2. FEM RX Control Logic
TP4
TP3
TP1
TP2
CN601
LG Electronics 88/115 LGE Property
4.12.3 Checking Mobile SW & FEM
EGSM/GSM850 DCS/PCS
FE1 OFF ON
FE2 OFF OFF
TP3
_
C604
(
FE1
)
FL60
TP1
TP2
TP4
_
C605
(
FE2
)
TP5 ~ 8
Mobile SW & FEM Circuit Diagram
Figure 8. Mobile SW & FEM Circuit
Checking Points
Figure 9. Mobile SW & FEM
Table 2. FEM RX Control Logic
TP4
TP3
TP1
TP2
CN601
zHM
0
881
,
5
.
638
10
6
L
F
02 91 31
11
81
51 8
41
7
216
95
4
013 61
2 1
17
ANT
1XR058MSG
2XR058MSG
4
D
N
G
1XR
0
09MSG 2CV
2X
R0
09
MS
G
1XR0081MSG 1DNG
2XR0081MSG 2DNG
1X
R0
0
91MSG
1CV
2X
R
009
1
MSG
X
T
0
09_
0
58MSG
5DNG
XT0091_0081MSG
3DNG 1CN 2
C
N
CN601
2
6
5
43
1
NI
1
D
NG
2
D
NG
3
D
NG
4
D
N
G
TUO
100n
L601
8.2p
C637
22p
C604
100R606
100R607
C607
47pF 47pF
C610
DNI
C612
ANT601
12n
L608
VC1
VC2
(FROM Transceiver)
(FROM Transceiver)
CI:$0.05(CMOS->PIN)
TP4
TP3
TP2
TP1